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• VISMinutes20170908

Agenda/Minutes of the VIS Meeting on 2017/9/8

2017/9/8 13:30 - 14:40

Participants: Mark, Aso, Shoda, Tanaka, Arai, Ishizaki, Sato, Okutomi, Enzo

Progress report

Schedule Chart

Type-A & Bp : (PDF,MPP)

Type-B: (PDF,MPP)

• Type-A: One week delay.
• Type-B: BS installation into chamber: Sept. 21
• Type-Bp: PRM installation into chamber: Sept. 19

Type-A (Takahashi)

Past week report

[X-end]

4th(Mon)

• Implemented the release sensors on the end plate for F1.
• Put the F1 on the end plate.
• Suspended the F2 and follows from the F1.

5th(Tue)

• Calibrated the LVDT in F1.
• Tuned the F1. The condition was changed by closing the cap. The lowest frequency was larger than 0.4Hz.
• Assembled the twist pair flat cables.
• Assembled the bridge frame.

6th(Wed)

• Tuned the F1 changing the compression of blades.

7th(Thu)

• Continued the F1 tuning. The lowest frequency was about 0.4 Hz.
• Started the cabling between the F2 and the F1.

8th(Fri)

• Continued the cabling.

Plan for coming weeks

• Lift down the F2 and F1 into the corrugate tube.
• Adjust the load on BF from the cross tube.
• Finish the installation of F1.

Type B (Mark)

Past week report

At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Yoshioka-kun, Kozu-kun):

• We characterized the remachined LBB blades, chose three and installed them in the LBB blade units in the PI.
• We removed all sticky labels from the PI and cleaned the affected areas (and as much as possible of the rest of the surface) with ethanol.
• We rearranged the arc weights on the PI to make space for the magic wand and installed the magic wand.
• We rearranged the magnets on the SF damper ring to suit three Cu segments (instead of two as in the test hang).
• We put proper vacuum-compatible tubing around all the stepper motor connections on the top of the PI (replacing cling wrap).
• We craned out the SF temporarily and retrieved the lost PEEK cable clamp collet from the BF.
• We closed the BF, craned the SF back in, and hooked the BF/..., this time with the hex cable clamp.
• We routed cables from the BF via the hex cable clamp to the SF level.
• We adjusted the BF trim mass for pitch, roll and vertical, and got the IRM hanging symmetrically around the IM.
• We adjusted all the IRM OSEMs laterally and in/out.
• We calibrated the SF LVDT and tested the SF FR stepper.
• We suspended the SF/... section and weighed it but found the old 7-mm maraging rod adapter did not hold it at the center, so we had to lift it with slings and could not accurately trim it for pitch/roll.
• Therefore we brought forward the craning in of the PI with the SF damper ring hanging from it.
• We suspended the SF successfully from the PI and unlocked the F0 keystone to check the mass budget. We needed about 1.5 kg extra, which is about right considering the hex cable clamp and cables.
• However we had to leave out the F0-SF hex cable clamp because of a bad thread on the inside of the cap. Hirata-san will make a new cap by enlarging the 7-mm hole in an old cap to 8 mm.

Plan for week of 9/13

Mark (except Wed, Fri), Fabian (except Mon, Tue), Enzo, Ohishi-san (except Mon-Wed), Hirata-san, Yoshioka-kun (Tue, Wed, Fri), Kozu-kun

• Reinstall F0-SF rod, this time with hex cable clamp.
• Route cables.
• Adjust SF trim mass, adjust tilt and vertical.
• Adjust SF damper gap.
• Cable and test IP LVDTs.
• Cable and test F0 LVDT.
• Cable and test PI steppers.
• Cable and test geophones.

Plan for week of 9/19

No work Mon 9/18 (敬老の日)<BR> Mark, Fabian, Enzo, Ohishi-san, Hirata-san, Yoshioka-kun (Tue, Wed, Fri), Kozu-kun

• Install LBB damper rings.
• Install suspension.

Vacation Info

Mark: 10/16-24

Type-Bp (Shoda)

Past week report

• Assembled everything
  • We have set the SF and hanged the BF and below. The weight and balance were adjusted so that the keystone height is about 65.5 mm. The resonant frequency of SF is about 0.31 Hz.
  • Checked the transfer function. BF stage seems to be OK. it seems to be necessary to adjust more on IM stage.
  • All motor connections are checked.
• We have a lot of dusts on the suspension since the ceiling is partially open because the company people hit the ceiling and it is now distorted.
  • Furuta-san and Hayakawa-san will fix it.
  • We need to clean the suspension carefully before the installation.

Plan for coming weeks

• IM adjustment and final status check
• Cleaning the suspension, prepare for the installation (poles should stand on the inner framem etc...)

IMMT (Ohishi)

Past week report

Plan for coming weeks

Watchdog system (Tanaka)

Past week report

• Creating the final version for mass production and running its operation test.-->Creating boards(WDS main board for Low power).

• Waiting for concrete information on installation location.The type(High power,Low power)and number actually needed,and the peripheral equipment accompanying it.-->Waiting for information provision.

• I held a meeting to make estimates with several vendors.-->Waiting for an estimate(Ongoing).

Plan for coming weeks

• Creating the final version for mass production and running its operation test.-->Implementation completion and operation test.

• Creation of extended I/O PCB(plot type (With the Main 4ch WDS box and I/O box,I/O board For relay).-->Ongoing.

Other site works

• Crane inspection: Sept. 25 11:30 - 12:30
• End of Aug. to Nov.: Mozumi entrance will be closed

Safety

• Incidents: no incident
• Foreseen risks
  • Type-A: Crane work. Work at height.
  • Type-B: Crane work. Work at height.
  • Type-Bp: No crane work.

Discussion

• Sub-chiefs

  • KAGRA_Organization_VIS.pdf

  • Will report the above plan to SEO.
• Coil driver circuit

  • Schematic

  • Watchdog: Check Michimura-kun's document for the required current.
  • Output C: Test it with BS.
• Parameter list for the sensitivity curve calculation

  • https://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0070/T1707038/006/kagra_sensitivity.pdf

  • No VIS parameter used.
• Seismometers

  • comp.png

  • It is difficult to judge if the expensive one is necessary or not.

Travel Plans

• Travel (Week of 9/11):
  • Takahashi: 11-12 (13 JPS)
  • Okutomi: 11-15
  • Sato: 11-15
  • Ishizaki:
  • Mark: 11-14 (13)
  • Fabian: 14-15
  • Hirata: 11-15
  • Enzo: 11-15
  • Shoda: 11-15 (13)
  • Ohishi: 13-15
  • Fujii:
  • Tanaka:
  • Yoshioka (Toyama): 11,12,14
  • Kozu (ICRR): 11-15
  • Arai (ICRR): 11-15
• Travel (Week of 9/18):
  • Takahashi: 19-22
  • Okutomi: 19-22
  • Sato: 19-22
  • Ishizaki: 19-21
  • Mark: 19-22
  • Fabian: 19-22
  • Hirata: 19-22
  • Enzo: 19-22
  • Shoda: 19-22
  • Ohishi:
  • Fujii:
  • Tanaka:
  • Yoshioka (Toyama): 18,21
  • Kozu (ICRR): 19-22
  • Arai (ICRR):

Next meeting

On 2017/9/15(Fri)